<template>
  <div class="login_container">
    <div class="login_box">
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 登录表单区域 --> 
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-yonghu-01"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-mima-01" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>  

<script>
export default {
  data(){
    return{
      //这个是登录表单的数据绑定对象
      loginForm:{
        username:'admin',
        password:'123456'
      },
      //这是表单的验证规则对象
      loginFormRules:{
        //验证用户名是否合法
        username:[
           { required: true, message: '请输入登录名称', trigger: 'blur' },
           { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        //验证密码是否合法
        password:[
           { required: true, message: '请输入登录密码', trigger: 'blur' },
           { min: 6,max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }

        ]
      }
    }
  },
  methods:{
    //点击重置按钮，重置登录表单
    resetLoginForm(){
      //console.log(this)
      this.$refs.loginFormRef.resetFields()
    },
    login(){
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return
        const {data:res} = await this.$http.post('login',this.loginForm)
        if (res.meta.status !==200) return this.$message.error('登录失败！')
        this.$message.success('登录成功')
        //1.将登录成功之后的token,保存到客户端的sessionStorage中
        //  1.1 项目出现登录之外的其他API接口，必须在登录之后才能访问
        //  1.2 token只应用在当前网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem('token',res.data.token)
        //2.通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push("/home")
      })
    }
  }
}
</script> 

<style lang="less" scoped>
  .login_container{
    background-color: #2b4b6b;
    height: 100%;

    .login_box{
      width: 450px;
      height: 300px;
      background-color: #fff;
      border-radius: 3px;
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%,-50%);

      .avatar_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
          width: 100%;
          height: 100%;
          border-radius: 50%;
          background-color: #eee;
        }
      }
    }
  }

  .login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }

  .btns{
    display: flex;
    justify-content: flex-end;
  }
</style>
